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Menneske SH

 
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Marty R.



Joined: 12 Feb 2006
Posts: 5770
Location: Rochester, NY, USA

PostPosted: Sat Sep 26, 2009 5:18 am    Post subject: Menneske SH Reply with quote

Puzzle 6150734, rated 21.

A strange-looking grid. The only move I've made was a W-Wing on 26 which took the 2 out of r4c1.

Code:

+-------------+---------+---------+
| 3   24  248 | 9 6 28  | 5 7  1  |
| 5   279 289 | 3 1 278 | 6 4  28 |
| 267 1   268 | 4 5 278 | 3 9  28 |
+-------------+---------+---------+
| 68  268 7   | 5 4 1   | 9 26 3  |
| 1   3   26  | 8 7 9   | 4 26 5  |
| 49  5   49  | 6 2 3   | 1 8  7  |
+-------------+---------+---------+
| 89  89  5   | 2 3 4   | 7 1  6  |
| 47  47  3   | 1 8 6   | 2 5  9  |
| 26  26  1   | 7 9 5   | 8 3  4  |
+-------------+---------+---------+

Play this puzzle online at the Daily Sudoku site
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storm_norm



Joined: 18 Oct 2007
Posts: 1741

PostPosted: Sat Sep 26, 2009 7:26 am    Post subject: Reply with quote

Code:
.---------------.---------------.---------------.
| 3    24   248 | 9    6    28  | 5    7    1   |
| 5    279  289 | 3    1    278 | 6    4    28  |
| 267  1    268 | 4    5    278 | 3    9    28  |
:---------------+---------------+---------------:
| 68   268  7   | 5    4    1   | 9    26   3   |
| 1    3    26  | 8    7    9   | 4    26   5   |
| 49   5    49  | 6    2    3   | 1    8    7   |
:---------------+---------------+---------------:
| 89   89   5   | 2    3    4   | 7    1    6   |
| 47   47   3   | 1    8    6   | 2    5    9   |
| 26   26   1   | 7    9    5   | 8    3    4   |
'---------------'---------------'---------------'

UR on {2,8} r23c39
strong link on the 6 in r2c3 and the 9 in r3c3
(2=6)r5c3 - UR28[(6)r3c3 = (9)r2c3] - (9)r2c2 = (9-8)r7c2 = (8)r4c2; r4c2 <>2

leaves xy-wing (247) removes 7 from r8c1 and r2c2
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arkietech



Joined: 31 Jul 2008
Posts: 1834
Location: Northwest Arkansas USA

PostPosted: Sat Sep 26, 2009 12:35 pm    Post subject: Reply with quote

Code:
 *-----------------------------------------------------------*
 | 3     248   248   | 9     6     28    | 5     7     1     |
 | 5     2789  289   | 3     1     278   | 6     4     28    |
 | 2678  1     268   | 4     5     278   | 3     9     28    |
 |-------------------+-------------------+-------------------|
 | 268   268   7     | 5     4     1     | 9     26    3     |
 | 1     3     26    | 8     7     9     | 4     26    5     |
 | 49    5     49    | 6     2     3     | 1     8     7     |
 |-------------------+-------------------+-------------------|
 | 89    89    5     | 2     3     4     | 7     1     6     |
 | 47    47    3     | 1     8     6     | 2     5     9     |
 | 26    26    1     | 7     9     5     | 8     3     4     |
 *-----------------------------------------------------------*
(4)r8c1=(4-7)r8c2=(7-9)r2c2=(9)r2c3-(9)r6c3=(9-4)r6c1=(4)r8c1 => r8c1=4
A discontinuous nice loop was used to set r8c1=4

Last edited by arkietech on Sat Sep 26, 2009 8:34 pm; edited 1 time in total
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Marty R.



Joined: 12 Feb 2006
Posts: 5770
Location: Rochester, NY, USA

PostPosted: Sat Sep 26, 2009 3:45 pm    Post subject: Reply with quote

Quote:
strong link on the 6 in r2c3 and the 9 in r3c3

Norm, I think you pointed out a similar strong link situation on a UR in another thread. Would you be kind enough to step me through the logic from the point where strong links are discovered on the non-deadly candidates to the point where an elimination can be done therefrom?
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daj95376



Joined: 23 Aug 2008
Posts: 3854

PostPosted: Sat Sep 26, 2009 5:31 pm    Post subject: Reply with quote

Marty R. wrote:
Quote:
strong link on the 6 in r3c3 and the 9 in r2c3

Norm, I think you pointed out a similar strong link situation on a UR in another thread. Would you be kind enough to step me through the logic from the point where strong links are discovered on the non-deadly candidates to the point where an elimination can be done therefrom?

First, we need to clear up the typo in Norm's quote. He has it correct in his chain.
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Marty R.



Joined: 12 Feb 2006
Posts: 5770
Location: Rochester, NY, USA

PostPosted: Sat Sep 26, 2009 8:03 pm    Post subject: Reply with quote

Quote:
First, we need to clear up the typo in Norm's quote. He has it correct in his chain.

Thanks Danny, I understood that there were typos with the positions of the 6 and 9 reversed.
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